Globigerinella wagneri


Classification: pf_cenozoic -> Globigerinidae -> Globigerinella -> Globigerinella wagneri
Sister taxa: G. adamsi, G. calida, G. radians, G. siphonifera, G. clavaticamerata, G. molinae, G. navazuelensis, G. obesa, G. praesiphonifera, G. pseudobesa, G. roeglina, G. megaperta, G. wagneri, G. sp.,

Taxonomy

Citation: Globigerinella wagneri (Rögl, 1994)
Rank: species
Basionym: Globigerina wagneri Rögl, 1994
Synonyms:
Taxonomic discussion:

This species is here placed in Globigerinella rather than Globigerina due to its slight tendency towards planispiral coiling and close link with Globigerinella megaperta. It bears an outward similarity to the Ciperoella ciperoensis and C. fariasi forms, and has been recorded as ‘giant Globigerina ciperoensis (Ujetz and Wernli, 1994), and thus is somewhat less planispirally coiled than the proposed ancestor Globigerinella obesa. This species has thus far not been found outside of the Paratethys region, although it is commonly recognized within it (Rögl, 1994; Cicha and others, 1998; Švábenická and others, 2007). Some specimens of G. wagneri may display a sac-like last chamber and/or aberrant chambers. In Austria this species occurs together with G. megaperta and other large planktonic species such as Dentoglobigerina globularis in a horizon characterized by typically large planktonic foraminiferal specimens that Rögl (1994) proposed can be traced from the Paratethys to the Caribbean. This horizon is interpreted as signaling cold waters and upwelling possibly due to a connection between the Paratethys and the northern seas in the Kiscellian (Baldi, 1984; Rögl, 1994). [Spezzaferri et al. 2018]

Catalog entries: Globigerina wagneri,

Type images:

Distinguishing features: Like obesa but looser coiling and 4-5 chambers in final whorl;

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters:

Globigerinella wagneri differs from G. megaperta by having 4-5 chambers in the last whorl instead of 5-6, by the low arched umbilical to extraumbilical aperture lacking a thick rim and less extreme uncoiling. It differs from 5 chambered species of Ciperoella, especially C. fariasi, by the lower spire and the wall texture, which is characterized by spine collars coalescing to form ridges and the lower spire. [Spezzaferri et al. 2018]


Wall type: Spinose, spines are supported by spine collars which coalesce to form ridges. Pore concentrations average 75-85 pores/50 μm2 test surface area and pore diameters average 2 μm.

Test morphology: Low trochospiral, evolute, lobulate in outline with depressed, straight and deeply incised sutures on both sides. Fourteen chambers are arranged in 2 whorls, the 4-5 globular chambers of the last whorl increase gradually in size, the penultimate chambers opens into the umbilicus. Aperture slightly extraumbilical, a very large low umbilical arch, open, quadrangular elongated. [Spezzaferri et al. 2018]

Size: Maximum diameter of the holotype 0.35 mm. [Spezzaferri et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Pseudoplanispiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:N/A
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: This species has been found in Haute Savoie, the Central Paratethys (Rögl, 1994; Ujetz and Wernli, 1994) and in Transylvania (Švábenická and others, 2007; Spezzaferri, personal observation). [Spezzaferri et al. 2018]

Isotope paleobiology: No data available. [Spezzaferri et al. 2018]

Phylogenetic relations: Globigerinella wagneri is ancestral to G. megaperta. These species represent an early radiation of large, unrolled planispiral morphologies in the genus Globigerinella in the lower Oligocene. This branch probably evolved from G. obesa in Zone O1 and gave rise to the siphonifera-homologue G. megaperta in Zone O3. [Spezzaferri et al. 2018]

Most likely ancestor: Globigerinella obesa - at confidence level 2 (out of 5). Data source: Spezzaferri et al. 2018.
Likely descendants: Globigerinella megaperta;

Biostratigraphic distribution

Geological Range:
Notes: This species has been described from the early Oligocene (Cicha and others, 1998) of the Austrian Molasse Basin (Rögl, 1994; Cicha and others, 1998) and spans the interval from Zone O1 to O5 (Rögl, 1994). [Spezzaferri et al. 2018]
Last occurrence (top): within O5 zone (26.93-28.09Ma, top in Chattian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): in mid part of O1 zone (50% up, 33Ma, in Priabonian stage). Data source: Spezzaferri et al. 2018 f6.1

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.6 p.204

References:

Baldi, T. (1984). The terminal Eocene and Early Oligocene events in Hungary and the separation of an anoxic, cold Paratethys. Eclogae Geologicae Helvetiae. 77: 1-27. gs

Cicha, I., Rögl, F., Rupp, C. & Ctyroká, J. (1998). Oligocene-Miocene foraminifera of the central Paratethys. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft. 549: 1-325. gs

Rögl, F. (1994). Globigerina ciperoensis (Foraminiferida) in the Oligocene and Miocene of the central Paratethys. Annalen des Naturhistorischen Museums in Wien. 96A: 133-159. gs

Spezzaferri, S., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46: 179-215. gs

Svabenicka, L., Bubík, M. & Stráník, Z. (2007). Biostratigraphy and paleoenvironmental changes on the transition from the Menilite to Krosno lithofacies (Western Carpathians, Czech Republic). Geologica Carpathica. 58: 237-262. gs

Ujetz, B. & Wernli, R. (1994). “Globigerina ciperoensis”, atypically giant planktonic foraminifers from the Oligocene of the Haute-Savoie, France. Annalen des Naturhistorischen Museums in Wien. 96A: , , 199-207. gs

Ujetz, B., Wernli, K. , P. & Wernli, R. (1994). Oligocene Foraminifera from the Val d’ Illiez Formation (Haute-Savoie, France): refined biostratigraphy and paleoecological analysis. Révue de Micropaléontologie. 37: 275-287. gs


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Globigerinella wagneri compiled by the pforams@mikrotax project team viewed: 17-7-2019

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